A Coriolis mass flowmeter having at least one curved measuring tube having an inlet end, outlet end and a central curved section between the inlet end and outlet end, a carrier bridge extending between the inlet end and outlet end of the measuring tube and fixing the measuring tube ends, at least one oscillation generator attached to the measuring tube, at least one oscillation sensor for detecting measuring tube oscillations, an evaluation unit for evaluating detected measuring tube oscillations, and wherein the measuring tube extends through at least one opening from an inner area of the carrier bridge out of the carrier bridge into the outer area of the carrier bridge, the central curved section running outside of the carrier bridge. A conductor guiding structure is arranged on the carrier bridge extending toward the oscillation sensor and the conductor arrangement fixed on the conductor guiding structure.

Coriolis mass flowmeter

A mass flow meter for flowing media that works on the Coriolis Principle has at least one essentially straight Coriolis pipeline carrying the flowing medium, with at least one oscillator acting on the Coriolis pipeline and with at least one transducer detecting Coriolis forces and/or Coriolis oscillations based on Coriolis forces. Measuring errors or mechanical damage due to temperature fluctuations and outside forces and torques are minimized or eliminated by providing a compensation cylinder, and arranging the Coriolis pipeline inside the compensation cylinder.

Mass flow meter

A fluid flow meter estimates the velocity of water or another fluid flowing through pipe by comparing measurements of the water velocity to one or more pre-determined templates. The fluid flow meter may collect measurement signals from one or more flow sensors, estimate the fluid velocity or flow rate by comparing the measurement signals to the template, and either store the comparison results in local memory, transmit the results to a remote memory or server, or both. In some embodiments, the fluid flow meter transmits the results to a server via a wireless interface. The transducers and processing system can be powered by a battery, a power line, or, for manifolds installed outdoors, a solar cell. Example transducers and processing systems may also have a passive wake-up feature for power reduction; that is, they may only draw power when water or another fluid flows through the pipe.

Methods and apparatus for fluid flow measurement

A capacitive pick off sensor for a mass flow measurement device is disclosed. The mass flow measurement device includes a flow sensor tube and a drive device for vibrating the flow sensor tube. The capacitive pick off sensor includes at least one conductive plate connectable to a first voltage potential and adapted to be situated adjacent the flow sensor tube which is connected to a second voltage potential. The conductive plate is positioned relative to the flow sensor tube so as to define a gap therebetween. The capacitance between the conductive plate and the flow sensor tube varies due to the relative motion of the conductive plate and the flow sensor tube when the flow sensor tube is vibrated. In other aspects of the present invention, the flow sensor tube is situated in a housing and the drive device is positioned outside the housing for vibrating the flow sensor tube.

Coriolis mass flow controller

The measurement transducer includes: A measuring tube vibrating at least at times during operation and serving for the conveying of a medium, wherein the measuring tube communicates with a pipeline via an inlet tube piece at an inlet end and an outlet tube piece at an outlet end; a counteroscillator, which is affixed to the measuring tube on the inlet end to form a first coupling zone and affixed to the measuring tube on the outlet end to form a second coupling zone; and a first cantilever for producing bending moments in the inlet tube piece and coupled with the inlet tube piece and the measuring tube essentially rigidly in the area of the first coupling zone and having a center of mass lying in the region of the inlet tube piece, as well as a second cantilever for producing bending moments in the outlet tube piece and coupled essentially rigidly with the outlet tube piece and the measuring tube in the region of the second coupling zone and having a center of mass lying in the region of the outlet tube piece. The measurement transducer of the invention is especially suited also for measuring tubes having large nominal diameters of more than 50 mm.

Measurement transducer of vibration type

A Coriolis mass flowmeter comprising two flow tubes (1, 2) formed with two curved tubes arranged in parallel with each other, a drive device (15), and a pair of vibration detecting sensors (16, 17), wherein an inlet side manifold (24) which distributes a measured fluid to the two flow tubes (1, 2) at a flow-in port and an outlet side manifold (25) which merges the measured fluid flowing through the two flow tubes (1, 2) and discharges it from a measured fluid flow-out port are connected mechanically to a main body (30) only on the flow-in side of the inlet side manifold (24) and the flow-out side of the outlet side manifold (25), respectively, whereby the effect of transmission of vibration from the main body (30) and all structural bodies connected to the main body can be reduced at the connection ends, which act as vibration support points, between the inlet side and outlet side manifolds (24, 25) and the flow tubes (1, 2)

A flowmeter includes: a transit time method unit having a sensor and a reception signal amplification control unit and a flow rate calculation unit which are connected to the sensor via a sensor selector switch; a pulse Doppler method having a reception signal amplification control unit and an integration calculation unit which are connected to the sensor; a transmission/reception timing control unit common to them; a measurement method selection control unit for controlling switching between the transit time method unit and the pulse Doppler method unit, and parallel operation; and a measurement value output selector switch for selecting the output of the transit time method unit and the pulse Doppler method unit. That is, the single flowmeter can perform flow rate measurement by the transit time method having no restriction on the measurement range as well as by the pulse Doppler method having an upper limit of the measurement range but enabling a highly accurate measurement.

Ultrasonic flowmeter and ultrasonic flow rate measurement method

An apparatus and method for measuring a flow velocity profile of fluid traveling in a pipe or conduit uses an ultrasonic wave transmitted from an ultrasonic wave transducer mounted at an angle on the outside of a pipe using a wedge, and made incident onto the fluid in the pipe to measure the fluid flow velocity profile, using the principle that a frequency of an ultrasonic wave, reflected by a reflector existing in the fluid, is changed depending on a flow velocity due to Doppler effect. The transmission frequency and the angle of incidence onto the pipe can be selected to suppress frequency dependence of a measured value due to Lamb wave and allow the flow velocity or flow rate of fluid to be measured with a greater accuracy.

Apparatus and method for measuring a fluid flow rate profile using acoustic doppler effect

A mass flow meter provides improved accuracy in measuring the mass flow rate of a fluid flowing through a straight measuring tube. The as measured mass flow rate value is changed by parameters such as the Young's modules, second moment of area, length, axial force, etc. of the measuring tube. The parameters change with the strain caused in the axial direction of the measuring tube. A strain sensor is installed on a measuring tube, and the as measured mass flow rate is corrected based on the output of the strain sensor. Since the strain affects in a different way the substantial mass flow rate and the zero point offset, the correction is conducted separately on the substantial mass flow rate and on the zero point offset so that the accuracy of measurement may be improved. Since the parameters change also with the temperature of the measuring tube, a temperature sensor is also installed on the measuring tube so that the accuracy of measurement may be further improved.

A wedge unit according to the present invention is used for an ultrasonic Doppler flow meter, being mounted on the outer wall of a pipe in which a fluid flows, supplying an ultrasonic wave to the fluid, receives the reflected wave and supplies the reflected wave to a flow rate calculation unit, comprises a wedge with one surface thereof being mounted on a part of the outer circumference of the pipe and on another surface thereof being equipped with an ultrasonic oscillator that generates the ultrasonic wave in response to an electric signal and receives the reflected wave; and an ultrasonic wave attenuation unit being mounted on the outer circumference of the pipe so as to include a position where an ultrasonic wave injected from the ultrasonic oscillator into the pipe by way of the wedge first reaches the outer wall of the pipe after being reflected by the inner wall thereof

Hironobu Yao

Papers

Coriolis mass flowmeter

Ultrasonic flowmeter and ultrasonic flow rate measurement method

Apparatus and method for measuring a fluid flow rate profile using acoustic doppler effect

Mass flow meter

Wedge and wedge unit for use in ultrasonic doppler flow meter